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Diffstat (limited to '')
-rw-r--r-- | gfx/angle/checkout/src/compiler/translator/tree_ops/RemoveInvariantDeclaration.cpp | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/gfx/angle/checkout/src/compiler/translator/tree_ops/RemoveInvariantDeclaration.cpp b/gfx/angle/checkout/src/compiler/translator/tree_ops/RemoveInvariantDeclaration.cpp new file mode 100644 index 0000000000..5a8ca44150 --- /dev/null +++ b/gfx/angle/checkout/src/compiler/translator/tree_ops/RemoveInvariantDeclaration.cpp @@ -0,0 +1,47 @@ +// +// Copyright 2016 The ANGLE Project Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. +// + +#include "compiler/translator/tree_ops/RemoveInvariantDeclaration.h" + +#include "compiler/translator/tree_util/IntermTraverse.h" + +namespace sh +{ + +namespace +{ + +// An AST traverser that removes invariant declaration for input in fragment shader +// when GLSL >= 4.20 and for output in vertex shader when GLSL < 4.2. +class RemoveInvariantDeclarationTraverser : public TIntermTraverser +{ + public: + RemoveInvariantDeclarationTraverser() : TIntermTraverser(true, false, false) {} + + private: + bool visitGlobalQualifierDeclaration(Visit visit, + TIntermGlobalQualifierDeclaration *node) override + { + if (node->isInvariant()) + { + TIntermSequence emptyReplacement; + mMultiReplacements.emplace_back(getParentNode()->getAsBlock(), node, + std::move(emptyReplacement)); + } + return false; + } +}; + +} // anonymous namespace + +bool RemoveInvariantDeclaration(TCompiler *compiler, TIntermNode *root) +{ + RemoveInvariantDeclarationTraverser traverser; + root->traverse(&traverser); + return traverser.updateTree(compiler, root); +} + +} // namespace sh |